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25#define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
26#define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
27
28#include <linux/file.h>
29#include <linux/fs.h>
30#include <linux/list.h>
31#include <linux/math64.h>
32#include <linux/mm.h>
33#include <linux/mutex.h>
34#include <linux/poll.h>
35#include <linux/slab.h>
36#include <linux/sched.h>
37#include <linux/types.h>
38#include <linux/uio.h>
39#include <linux/uaccess.h>
40#include <linux/module.h>
41#include <sound/core.h>
42#include <sound/initval.h>
43#include <sound/compress_params.h>
44#include <sound/compress_offload.h>
45#include <sound/compress_driver.h>
46
47
48
49
50
51
52
53
54static DEFINE_MUTEX(device_mutex);
55
56struct snd_compr_file {
57 unsigned long caps;
58 struct snd_compr_stream stream;
59};
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76static int snd_compr_open(struct inode *inode, struct file *f)
77{
78 struct snd_compr *compr;
79 struct snd_compr_file *data;
80 struct snd_compr_runtime *runtime;
81 enum snd_compr_direction dirn;
82 int maj = imajor(inode);
83 int ret;
84
85 if ((f->f_flags & O_ACCMODE) == O_WRONLY)
86 dirn = SND_COMPRESS_PLAYBACK;
87 else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
88 dirn = SND_COMPRESS_CAPTURE;
89 else
90 return -EINVAL;
91
92 if (maj == snd_major)
93 compr = snd_lookup_minor_data(iminor(inode),
94 SNDRV_DEVICE_TYPE_COMPRESS);
95 else
96 return -EBADFD;
97
98 if (compr == NULL) {
99 pr_err("no device data!!!\n");
100 return -ENODEV;
101 }
102
103 if (dirn != compr->direction) {
104 pr_err("this device doesn't support this direction\n");
105 snd_card_unref(compr->card);
106 return -EINVAL;
107 }
108
109 data = kzalloc(sizeof(*data), GFP_KERNEL);
110 if (!data) {
111 snd_card_unref(compr->card);
112 return -ENOMEM;
113 }
114 data->stream.ops = compr->ops;
115 data->stream.direction = dirn;
116 data->stream.private_data = compr->private_data;
117 data->stream.device = compr;
118 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
119 if (!runtime) {
120 kfree(data);
121 snd_card_unref(compr->card);
122 return -ENOMEM;
123 }
124 runtime->state = SNDRV_PCM_STATE_OPEN;
125 init_waitqueue_head(&runtime->sleep);
126 data->stream.runtime = runtime;
127 f->private_data = (void *)data;
128 mutex_lock(&compr->lock);
129 ret = compr->ops->open(&data->stream);
130 mutex_unlock(&compr->lock);
131 if (ret) {
132 kfree(runtime);
133 kfree(data);
134 }
135 snd_card_unref(compr->card);
136 return 0;
137}
138
139static int snd_compr_free(struct inode *inode, struct file *f)
140{
141 struct snd_compr_file *data = f->private_data;
142 data->stream.ops->free(&data->stream);
143 kfree(data->stream.runtime->buffer);
144 kfree(data->stream.runtime);
145 kfree(data);
146 return 0;
147}
148
149static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
150 struct snd_compr_tstamp *tstamp)
151{
152 if (!stream->ops->pointer)
153 return -ENOTSUPP;
154 stream->ops->pointer(stream, tstamp);
155 pr_debug("dsp consumed till %d total %d bytes\n",
156 tstamp->byte_offset, tstamp->copied_total);
157 if (stream->direction == SND_COMPRESS_PLAYBACK)
158 stream->runtime->total_bytes_transferred = tstamp->copied_total;
159 else
160 stream->runtime->total_bytes_available = tstamp->copied_total;
161 return 0;
162}
163
164static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
165 struct snd_compr_avail *avail)
166{
167 memset(avail, 0, sizeof(*avail));
168 snd_compr_update_tstamp(stream, &avail->tstamp);
169
170
171 if (stream->runtime->total_bytes_available == 0 &&
172 stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
173 stream->direction == SND_COMPRESS_PLAYBACK) {
174 pr_debug("detected init and someone forgot to do a write\n");
175 return stream->runtime->buffer_size;
176 }
177 pr_debug("app wrote %lld, DSP consumed %lld\n",
178 stream->runtime->total_bytes_available,
179 stream->runtime->total_bytes_transferred);
180 if (stream->runtime->total_bytes_available ==
181 stream->runtime->total_bytes_transferred) {
182 if (stream->direction == SND_COMPRESS_PLAYBACK) {
183 pr_debug("both pointers are same, returning full avail\n");
184 return stream->runtime->buffer_size;
185 } else {
186 pr_debug("both pointers are same, returning no avail\n");
187 return 0;
188 }
189 }
190
191 avail->avail = stream->runtime->total_bytes_available -
192 stream->runtime->total_bytes_transferred;
193 if (stream->direction == SND_COMPRESS_PLAYBACK)
194 avail->avail = stream->runtime->buffer_size - avail->avail;
195
196 pr_debug("ret avail as %lld\n", avail->avail);
197 return avail->avail;
198}
199
200static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
201{
202 struct snd_compr_avail avail;
203
204 return snd_compr_calc_avail(stream, &avail);
205}
206
207static int
208snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
209{
210 struct snd_compr_avail ioctl_avail;
211 size_t avail;
212
213 avail = snd_compr_calc_avail(stream, &ioctl_avail);
214 ioctl_avail.avail = avail;
215
216 if (copy_to_user((__u64 __user *)arg,
217 &ioctl_avail, sizeof(ioctl_avail)))
218 return -EFAULT;
219 return 0;
220}
221
222static int snd_compr_write_data(struct snd_compr_stream *stream,
223 const char __user *buf, size_t count)
224{
225 void *dstn;
226 size_t copy;
227 struct snd_compr_runtime *runtime = stream->runtime;
228
229 u64 app_pointer = div64_u64(runtime->total_bytes_available,
230 runtime->buffer_size);
231 app_pointer = runtime->total_bytes_available -
232 (app_pointer * runtime->buffer_size);
233
234 dstn = runtime->buffer + app_pointer;
235 pr_debug("copying %ld at %lld\n",
236 (unsigned long)count, app_pointer);
237 if (count < runtime->buffer_size - app_pointer) {
238 if (copy_from_user(dstn, buf, count))
239 return -EFAULT;
240 } else {
241 copy = runtime->buffer_size - app_pointer;
242 if (copy_from_user(dstn, buf, copy))
243 return -EFAULT;
244 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
245 return -EFAULT;
246 }
247
248 if (stream->ops->ack)
249 stream->ops->ack(stream, count);
250 return count;
251}
252
253static ssize_t snd_compr_write(struct file *f, const char __user *buf,
254 size_t count, loff_t *offset)
255{
256 struct snd_compr_file *data = f->private_data;
257 struct snd_compr_stream *stream;
258 size_t avail;
259 int retval;
260
261 if (snd_BUG_ON(!data))
262 return -EFAULT;
263
264 stream = &data->stream;
265 mutex_lock(&stream->device->lock);
266
267 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
268 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
269 mutex_unlock(&stream->device->lock);
270 return -EBADFD;
271 }
272
273 avail = snd_compr_get_avail(stream);
274 pr_debug("avail returned %ld\n", (unsigned long)avail);
275
276 if (avail > count)
277 avail = count;
278
279 if (stream->ops->copy) {
280 char __user* cbuf = (char __user*)buf;
281 retval = stream->ops->copy(stream, cbuf, avail);
282 } else {
283 retval = snd_compr_write_data(stream, buf, avail);
284 }
285 if (retval > 0)
286 stream->runtime->total_bytes_available += retval;
287
288
289
290 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
291 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
292 pr_debug("stream prepared, Houston we are good to go\n");
293 }
294
295 mutex_unlock(&stream->device->lock);
296 return retval;
297}
298
299
300static ssize_t snd_compr_read(struct file *f, char __user *buf,
301 size_t count, loff_t *offset)
302{
303 struct snd_compr_file *data = f->private_data;
304 struct snd_compr_stream *stream;
305 size_t avail;
306 int retval;
307
308 if (snd_BUG_ON(!data))
309 return -EFAULT;
310
311 stream = &data->stream;
312 mutex_lock(&stream->device->lock);
313
314
315
316
317
318 switch (stream->runtime->state) {
319 case SNDRV_PCM_STATE_OPEN:
320 case SNDRV_PCM_STATE_PREPARED:
321 case SNDRV_PCM_STATE_XRUN:
322 case SNDRV_PCM_STATE_SUSPENDED:
323 case SNDRV_PCM_STATE_DISCONNECTED:
324 retval = -EBADFD;
325 goto out;
326 }
327
328 avail = snd_compr_get_avail(stream);
329 pr_debug("avail returned %ld\n", (unsigned long)avail);
330
331 if (avail > count)
332 avail = count;
333
334 if (stream->ops->copy) {
335 retval = stream->ops->copy(stream, buf, avail);
336 } else {
337 retval = -ENXIO;
338 goto out;
339 }
340 if (retval > 0)
341 stream->runtime->total_bytes_transferred += retval;
342
343out:
344 mutex_unlock(&stream->device->lock);
345 return retval;
346}
347
348static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
349{
350 return -ENXIO;
351}
352
353static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
354{
355 if (stream->direction == SND_COMPRESS_PLAYBACK)
356 return POLLOUT | POLLWRNORM;
357 else
358 return POLLIN | POLLRDNORM;
359}
360
361static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
362{
363 struct snd_compr_file *data = f->private_data;
364 struct snd_compr_stream *stream;
365 size_t avail;
366 int retval = 0;
367
368 if (snd_BUG_ON(!data))
369 return -EFAULT;
370 stream = &data->stream;
371 if (snd_BUG_ON(!stream))
372 return -EFAULT;
373
374 mutex_lock(&stream->device->lock);
375 if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
376 stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
377 retval = -EBADFD;
378 goto out;
379 }
380 poll_wait(f, &stream->runtime->sleep, wait);
381
382 avail = snd_compr_get_avail(stream);
383 pr_debug("avail is %ld\n", (unsigned long)avail);
384
385 switch (stream->runtime->state) {
386 case SNDRV_PCM_STATE_DRAINING:
387
388
389
390 retval = snd_compr_get_poll(stream);
391 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
392 break;
393 case SNDRV_PCM_STATE_RUNNING:
394 case SNDRV_PCM_STATE_PREPARED:
395 case SNDRV_PCM_STATE_PAUSED:
396 if (avail >= stream->runtime->fragment_size)
397 retval = snd_compr_get_poll(stream);
398 break;
399 default:
400 if (stream->direction == SND_COMPRESS_PLAYBACK)
401 retval = POLLOUT | POLLWRNORM | POLLERR;
402 else
403 retval = POLLIN | POLLRDNORM | POLLERR;
404 break;
405 }
406out:
407 mutex_unlock(&stream->device->lock);
408 return retval;
409}
410
411static int
412snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
413{
414 int retval;
415 struct snd_compr_caps caps;
416
417 if (!stream->ops->get_caps)
418 return -ENXIO;
419
420 memset(&caps, 0, sizeof(caps));
421 retval = stream->ops->get_caps(stream, &caps);
422 if (retval)
423 goto out;
424 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
425 retval = -EFAULT;
426out:
427 return retval;
428}
429
430static int
431snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
432{
433 int retval;
434 struct snd_compr_codec_caps *caps;
435
436 if (!stream->ops->get_codec_caps)
437 return -ENXIO;
438
439 caps = kzalloc(sizeof(*caps), GFP_KERNEL);
440 if (!caps)
441 return -ENOMEM;
442
443 retval = stream->ops->get_codec_caps(stream, caps);
444 if (retval)
445 goto out;
446 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
447 retval = -EFAULT;
448
449out:
450 kfree(caps);
451 return retval;
452}
453
454
455static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
456 struct snd_compr_params *params)
457{
458 unsigned int buffer_size;
459 void *buffer;
460
461 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
462 if (stream->ops->copy) {
463 buffer = NULL;
464
465
466
467 } else {
468 buffer = kmalloc(buffer_size, GFP_KERNEL);
469 if (!buffer)
470 return -ENOMEM;
471 }
472 stream->runtime->fragment_size = params->buffer.fragment_size;
473 stream->runtime->fragments = params->buffer.fragments;
474 stream->runtime->buffer = buffer;
475 stream->runtime->buffer_size = buffer_size;
476 return 0;
477}
478
479static int snd_compress_check_input(struct snd_compr_params *params)
480{
481
482 if (params->buffer.fragment_size == 0 ||
483 params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
484 return -EINVAL;
485
486
487 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
488 return -EINVAL;
489
490 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
491 return -EINVAL;
492
493 if (!(params->codec.sample_rate & SNDRV_PCM_RATE_8000_192000))
494 return -EINVAL;
495
496 return 0;
497}
498
499static int
500snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
501{
502 struct snd_compr_params *params;
503 int retval;
504
505 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
506
507
508
509
510 params = kmalloc(sizeof(*params), GFP_KERNEL);
511 if (!params)
512 return -ENOMEM;
513 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
514 retval = -EFAULT;
515 goto out;
516 }
517
518 retval = snd_compress_check_input(params);
519 if (retval)
520 goto out;
521
522 retval = snd_compr_allocate_buffer(stream, params);
523 if (retval) {
524 retval = -ENOMEM;
525 goto out;
526 }
527
528 retval = stream->ops->set_params(stream, params);
529 if (retval)
530 goto out;
531
532 stream->metadata_set = false;
533 stream->next_track = false;
534
535 if (stream->direction == SND_COMPRESS_PLAYBACK)
536 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
537 else
538 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
539 } else {
540 return -EPERM;
541 }
542out:
543 kfree(params);
544 return retval;
545}
546
547static int
548snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
549{
550 struct snd_codec *params;
551 int retval;
552
553 if (!stream->ops->get_params)
554 return -EBADFD;
555
556 params = kzalloc(sizeof(*params), GFP_KERNEL);
557 if (!params)
558 return -ENOMEM;
559 retval = stream->ops->get_params(stream, params);
560 if (retval)
561 goto out;
562 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
563 retval = -EFAULT;
564
565out:
566 kfree(params);
567 return retval;
568}
569
570static int
571snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
572{
573 struct snd_compr_metadata metadata;
574 int retval;
575
576 if (!stream->ops->get_metadata)
577 return -ENXIO;
578
579 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
580 return -EFAULT;
581
582 retval = stream->ops->get_metadata(stream, &metadata);
583 if (retval != 0)
584 return retval;
585
586 if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
587 return -EFAULT;
588
589 return 0;
590}
591
592static int
593snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
594{
595 struct snd_compr_metadata metadata;
596 int retval;
597
598 if (!stream->ops->set_metadata)
599 return -ENXIO;
600
601
602
603
604 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
605 return -EFAULT;
606
607 retval = stream->ops->set_metadata(stream, &metadata);
608 stream->metadata_set = true;
609
610 return retval;
611}
612
613static inline int
614snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
615{
616 struct snd_compr_tstamp tstamp = {0};
617 int ret;
618
619 ret = snd_compr_update_tstamp(stream, &tstamp);
620 if (ret == 0)
621 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
622 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
623 return ret;
624}
625
626static int snd_compr_pause(struct snd_compr_stream *stream)
627{
628 int retval;
629
630 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
631 return -EPERM;
632 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
633 if (!retval)
634 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
635 return retval;
636}
637
638static int snd_compr_resume(struct snd_compr_stream *stream)
639{
640 int retval;
641
642 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
643 return -EPERM;
644 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
645 if (!retval)
646 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
647 return retval;
648}
649
650static int snd_compr_start(struct snd_compr_stream *stream)
651{
652 int retval;
653
654 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
655 return -EPERM;
656 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
657 if (!retval)
658 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
659 return retval;
660}
661
662static int snd_compr_stop(struct snd_compr_stream *stream)
663{
664 int retval;
665
666 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
667 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
668 return -EPERM;
669 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
670 if (!retval) {
671 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
672 wake_up(&stream->runtime->sleep);
673 stream->runtime->total_bytes_available = 0;
674 stream->runtime->total_bytes_transferred = 0;
675 }
676 return retval;
677}
678
679static int snd_compr_drain(struct snd_compr_stream *stream)
680{
681 int retval;
682
683 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
684 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
685 return -EPERM;
686 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
687 if (!retval) {
688 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
689 wake_up(&stream->runtime->sleep);
690 }
691 return retval;
692}
693
694static int snd_compr_next_track(struct snd_compr_stream *stream)
695{
696 int retval;
697
698
699 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
700 return -EPERM;
701
702
703
704
705 if (stream->metadata_set == false)
706 return -EPERM;
707
708 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
709 if (retval != 0)
710 return retval;
711 stream->metadata_set = false;
712 stream->next_track = true;
713 return 0;
714}
715
716static int snd_compr_partial_drain(struct snd_compr_stream *stream)
717{
718 int retval;
719 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
720 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
721 return -EPERM;
722
723 if (stream->next_track == false)
724 return -EPERM;
725
726 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
727
728 stream->next_track = false;
729 return retval;
730}
731
732static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
733{
734 struct snd_compr_file *data = f->private_data;
735 struct snd_compr_stream *stream;
736 int retval = -ENOTTY;
737
738 if (snd_BUG_ON(!data))
739 return -EFAULT;
740 stream = &data->stream;
741 if (snd_BUG_ON(!stream))
742 return -EFAULT;
743 mutex_lock(&stream->device->lock);
744 switch (_IOC_NR(cmd)) {
745 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
746 put_user(SNDRV_COMPRESS_VERSION,
747 (int __user *)arg) ? -EFAULT : 0;
748 break;
749 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
750 retval = snd_compr_get_caps(stream, arg);
751 break;
752 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
753 retval = snd_compr_get_codec_caps(stream, arg);
754 break;
755 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
756 retval = snd_compr_set_params(stream, arg);
757 break;
758 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
759 retval = snd_compr_get_params(stream, arg);
760 break;
761 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
762 retval = snd_compr_set_metadata(stream, arg);
763 break;
764 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
765 retval = snd_compr_get_metadata(stream, arg);
766 break;
767 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
768 retval = snd_compr_tstamp(stream, arg);
769 break;
770 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
771 retval = snd_compr_ioctl_avail(stream, arg);
772 break;
773 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
774 retval = snd_compr_pause(stream);
775 break;
776 case _IOC_NR(SNDRV_COMPRESS_RESUME):
777 retval = snd_compr_resume(stream);
778 break;
779 case _IOC_NR(SNDRV_COMPRESS_START):
780 retval = snd_compr_start(stream);
781 break;
782 case _IOC_NR(SNDRV_COMPRESS_STOP):
783 retval = snd_compr_stop(stream);
784 break;
785 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
786 retval = snd_compr_drain(stream);
787 break;
788 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
789 retval = snd_compr_partial_drain(stream);
790 break;
791 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
792 retval = snd_compr_next_track(stream);
793 break;
794
795 }
796 mutex_unlock(&stream->device->lock);
797 return retval;
798}
799
800static const struct file_operations snd_compr_file_ops = {
801 .owner = THIS_MODULE,
802 .open = snd_compr_open,
803 .release = snd_compr_free,
804 .write = snd_compr_write,
805 .read = snd_compr_read,
806 .unlocked_ioctl = snd_compr_ioctl,
807 .mmap = snd_compr_mmap,
808 .poll = snd_compr_poll,
809};
810
811static int snd_compress_dev_register(struct snd_device *device)
812{
813 int ret = -EINVAL;
814 char str[16];
815 struct snd_compr *compr;
816
817 if (snd_BUG_ON(!device || !device->device_data))
818 return -EBADFD;
819 compr = device->device_data;
820
821 sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
822 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
823 compr->direction);
824
825 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
826 compr->device, &snd_compr_file_ops, compr, str);
827 if (ret < 0) {
828 pr_err("snd_register_device failed\n %d", ret);
829 return ret;
830 }
831 return ret;
832
833}
834
835static int snd_compress_dev_disconnect(struct snd_device *device)
836{
837 struct snd_compr *compr;
838
839 compr = device->device_data;
840 snd_unregister_device(compr->direction, compr->card, compr->device);
841 return 0;
842}
843
844
845
846
847
848
849
850
851int snd_compress_new(struct snd_card *card, int device,
852 int dirn, struct snd_compr *compr)
853{
854 static struct snd_device_ops ops = {
855 .dev_free = NULL,
856 .dev_register = snd_compress_dev_register,
857 .dev_disconnect = snd_compress_dev_disconnect,
858 };
859
860 compr->card = card;
861 compr->device = device;
862 compr->direction = dirn;
863 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
864}
865EXPORT_SYMBOL_GPL(snd_compress_new);
866
867static int snd_compress_add_device(struct snd_compr *device)
868{
869 int ret;
870
871 if (!device->card)
872 return -EINVAL;
873
874
875 ret = snd_card_register(device->card);
876 if (ret)
877 goto out;
878 return 0;
879
880out:
881 pr_err("failed with %d\n", ret);
882 return ret;
883
884}
885
886static int snd_compress_remove_device(struct snd_compr *device)
887{
888 return snd_card_free(device->card);
889}
890
891
892
893
894
895
896int snd_compress_register(struct snd_compr *device)
897{
898 int retval;
899
900 if (device->name == NULL || device->dev == NULL || device->ops == NULL)
901 return -EINVAL;
902
903 pr_debug("Registering compressed device %s\n", device->name);
904 if (snd_BUG_ON(!device->ops->open))
905 return -EINVAL;
906 if (snd_BUG_ON(!device->ops->free))
907 return -EINVAL;
908 if (snd_BUG_ON(!device->ops->set_params))
909 return -EINVAL;
910 if (snd_BUG_ON(!device->ops->trigger))
911 return -EINVAL;
912
913 mutex_init(&device->lock);
914
915
916 mutex_lock(&device_mutex);
917 retval = snd_compress_add_device(device);
918 mutex_unlock(&device_mutex);
919 return retval;
920}
921EXPORT_SYMBOL_GPL(snd_compress_register);
922
923int snd_compress_deregister(struct snd_compr *device)
924{
925 pr_debug("Removing compressed device %s\n", device->name);
926 mutex_lock(&device_mutex);
927 snd_compress_remove_device(device);
928 mutex_unlock(&device_mutex);
929 return 0;
930}
931EXPORT_SYMBOL_GPL(snd_compress_deregister);
932
933static int __init snd_compress_init(void)
934{
935 return 0;
936}
937
938static void __exit snd_compress_exit(void)
939{
940}
941
942module_init(snd_compress_init);
943module_exit(snd_compress_exit);
944
945MODULE_DESCRIPTION("ALSA Compressed offload framework");
946MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
947MODULE_LICENSE("GPL v2");
948
